基本解释n.光年同根派生 light-year相关词英汉例句用作名詞 (n.)The distance can be expressed in light years.距離可以用光年表示。A place that requires one year for light to reach is one light year distant from us.因此光需要一年時間才能到達的地方離我們也就是一光年的距離。light-year更多例句